Marinate the pork belly with the rice wine and the ground black pepper for about 15 mins.
Cook the kimchi in a skillet until soft.
Place the marinated meat at the bottom of the pot. Add all the other ingredients—kimchi, onion, mushrooms, tofu, water, and the base sauce—into the pot, except for the green onion.
Bring the pot to a boil over medium-high heat. Once boiling, lower the heat to medium and continue cooking until the meat is completely cooked through, which should take about 10 to 15 minutes.
When the meat is done, add the green onion, give it a final gentle mix, and turn off the heat.
Serve with a bowl of rice and other Korean side dishes.
